Compressor working all the time?

No, just Volvo diagnostic.

 

I'm also getting warning on the the screen that air dryer leaking, few times a day and sometimes every 5 minutes.

 

probably a leak in signal line from the govoner, seems most times when your cutting in too soon that is where iv found the problem.

edit, just went back and read and see you have a electronic governor, iv never even seen such a thing so i got no idea

you also say that you get a fault for your air dryer leaking, you could try a new purge valve, or what i typically iv always run ad-9's but i normally one truck dealer or another will typically run a sale in the fall for re-man air dryers for 120 bucks or so + exchange, and so ill just swap the whole unit out. might see what they are offering for your unit.